#### devop

##### Full Member level 1

**how to calculate the EM**

Hi :

how does the ICC calculate the EM problems??

go to lef to find the max current density limite,

then ....how to calculate a max density of a certain path??

thanks a lot

Added after 42 minutes:

To calculate current density, Astro first needs to run timing analysis to determine the transition time for each net. Once the current density is calculated, it is checked against the constraint to determine whether it is a violation. The constraint depends on the width of each metal segment and the temperature specified.devop said:Hi :

how does the ICC calculate the EM problems??

go to lef to find the max current density limite,

then ....how to calculate a max density of a certain path??

thanks a lot

I think it's easy to calculate the current flow through VDD to GND(based on the lib),but how to calculate the current flow through a signal net, calculate base on the extracted RC model of net?I think it's a huge data.

can anyone help?